[Asterisk-Users] chan_local segfault

[Mark Spencer]

it wasn't even anything as excusable as a race.  Simply put, I was never
pulling them out of the linked list.  This only broke the "show locals"
command, but it's fixed in current CVS.

Mark

On 7 Apr 2003, Karl Putland wrote:

> Happened twice.  There might also be a race condition and some bad
> pointers in chan_local.locals_show.
>
> First the segfault.
>
> CLI> show locals
> <unowned> -- 6001 at default
> Segmentation fault (core dumped)
> [root at mars asterisk]# ll -tr
> total 22260
>
> [...]
> Loaded symbols for /usr/lib/asterisk/modules/chan_local.so
> #0  __pthread_mutex_lock (mutex=0x5d8) at mutex.c:99
> 99      mutex.c: No such file or directory.
>         in mutex.c
> (gdb) bt
> #0  __pthread_mutex_lock (mutex=0x5d8) at mutex.c:99
> #1  0x4161ed29 in locals_show (fd=1, argc=2, argv=0xbffff770) at chan_local.c:358
> #2  0x08067268 in ast_cli_command (fd=1, s=0x80be7c8 "show locals") at cli.c:911
> #3  0x080777ab in consolehandler (s=0x80be7c8 "show locals") at asterisk.c:475
> #4  0x080792ed in main (argc=2, argv=0xbffffc74) at asterisk.c:1335
> #5  0x400c8336 in __libc_start_main (main=0x8078900 <main>, argc=2, ubp_av=0xbffffc74, init=0x804ff8c <_init>, fini=0x8099e50 <_fini>, rtld_fini=0x4000d2fc <_dl_fini>,
>     stack_end=0xbffffc6c) at ../sysdeps/generic/libc-start.c:129
> (gdb)
>
>
> Now for something completely different.
>
> *CLI> show locals
> Local/6001 at default-1 -- 6001 at default
> <unowned> -- __se at s 2
>
> *CLI> show locals
> Local/6001 at default-1 -- 6001 at default
> <unowned> -- __se at s 2
>
>     -- Nobody picked up in 20000 ms
>     -- Hungup 'IAX[peracles]/4'
>     -- Executing VoiceMail("Local/6001 at default-1", "u1234") in new stack
>   == Parsing '/etc/asterisk/voicemail.conf': Found
>     -- Playing 'vm/1234/unavail'
>     -- Playing 'vm-intro'
>     -- Playing 'beep'
>     -- Recording to /var/spool/asterisk/vm/1234/INBOX/msg0012
> WARNING[21525]: File app_voicemail.c, Line 631 (leave_voicemail): No
> audio available on Local/6001 at default-1??
>     -- User hung up
>   == Parsing '/etc/asterisk/voicemail.conf': Found
>   == Spawn extension (macro-stdexten, s, 2) exited non-zero on
> 'Local/6001 at default-1' in macro 'stdexten'
>   == Spawn extension (default, 1999, 1) exited non-zero on
> 'Local/6001 at default-1'
>     -- User disconnected when they almost made it
>   == Spawn extension (default, 6001, 2) exited non-zero on
> 'Local/6001 at default-2'
> show locals
> <unowned> -- 6001 at default
> UåWVSì|ÇE -- @s 2
>
> Segmentation fault (core dumped)
>
> This segfault Produced same traceback as above
>
>
>
>
> The above results were produced by
>
> extenstion.conf
>
> exten => 1998,1,Macro(stdexten,1234,IAX/kputland)
> exten => 1999,1,Macro(stdexten,1234,IAX/peracles)
>
> exten => 6001,1,Answer
> exten => 6001,2,Queue(dialer)
>
>
>
> Executing this command on the manager port.
>
> Action: Originate
> Exten: 1999
> Channel: Local/6001
>
> Then running
> show locals
> over and over and over again rather quickly.
>
>
> --
> Karl Putland <karl at putland.linux-site.net>
>
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